transfer their DVD backups without reencoding into Blu-ray or AVCHD format (DVD menu is not imported)

watch their Blu-ray Disc backups without reencoding (PS3) (just select your movie M2TS file from the original BDMV\STREAM folder (the largest one) and use it with multiAVCHD; you can put .srt subtitles in the same folder, named 000XX.srt where 000XX is your M2TS file). multiAVCHD will split it in 4GB chunks, so you'll be able to transfer it to your external USB disk or USB flash drive.

You can re-author a HDMV authored blu-ray disc to be played in your Playstation 3 with an external USB HDD in few minutes. Just drag BDMV folder to multiAVCHD and select START - PLAYSTATION 3.
You can also remove audio tracks and add your own (external) tracks to keep final size smaller or re-encode existing HD audio tracks to much smaller (but quality) AC3 audio tracks. 20GB bluray disk movie takes about 10-20 minutes to be transferred to an AVCHD compatible folder, playable in any BD (BluRay Disk Player) or Playstation 3.